Re: soil or rock definitions

From: Alberto Fasso' <fasso_at_slac.stanford.edu>
Date: Wed, 6 Feb 2013 02:27:54 -0800 (PST)

Hi Takashi,

every case of soil or rock has its particular composition, which can only be
determined by a chemical analysis.
However, it is easy to find on Internet "average" or "typical" compositions
for a given type of rock. For shielding purposes, calculation results are
only weakly dependent on the actual precise composition (the most abundant
element being nearly always Oxygen). A chemical analysis, however, is essential
for activation studies.

Concerning granite, I found the following on Wikipedia:

A worldwide average of the chemical composition of granite, by weight
percent: [Harvey Blatt and Robert J. Tracy (1997). Petrology (2nd ed.).
New York: Freeman. p. 66. ISBN 0-7167-2438-3]

SiO2 . 72.04% (silica)
Al2O3 . 14.42% (alumina)
K2O . 4.12%
Na2O . 3.69%
CaO . 1.82%
FeO . 1.68%
Fe2O3 . 1.22%
MgO . 0.71%
TiO2 . 0.30%
P2O5 . 0.12%
MnO . 0.05%
Based on 2485 analyses

The average density of granite is between 2.65 [ "Basic Rock Mechanics".
Webpages.sdsmt.edu. Retrieved 2010-05-09] and 2.75 g/cm3.

Alberto


On Tue, 5 Feb 2013, Maruyama, Takashi wrote:

> 2013 19:28:24 +0100 (CET)
> X-Virus-Scanned: clamav-milter 0.97.6 at smtp2.mi.infn.it
> X-Virus-Status: Clean
> Sender: owner-fluka-discuss_at_mi.infn.it
>
> This must be already discussed, but how can I define "soil" or "rock"? There
> are all kinds of soil/rock so how about "granite"?
>
> Takashi Maruyama
> SLAC
Received on Wed Feb 06 2013 - 18:00:48 CET

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